Listen dude. I will bet you 10gs that you aren't going to pull over 3.5 pounds . It's going to be between 2-3. We all understand that isn't what you wanted. I've got 3 pounds off of 4 lights before and had to eat top ramen for 2 months. So prepare to be bummed out. The way you grew these plants, you would be better using vertical lighting. You want a full even canopy when growing with hoods you have trees in there, the bottom nugs are going to be under developed.
Don't ask for information and get mad at the outcome. Full even canopy next time. Top your plants many times or have way more of them in that space. And co2 bags are shit. Use the tanks or exchange air. Bring In fresh with the intake fan and then have an outtake fan exhausting air. I don't understand why you plucked leaves when your room is practically empty. Don't de-foliage your plants unless your canopy is full as hell. Also growing from seed is risky and unwise if your trying to turn a profit. Seed grows are for fun. Unless you get a 1 in a million pheno at which point it would work to your advantage with runs down the road, not the current run. Find genetics that you already know are potent and yield well. A lot of light, doesn't mean a lot of buds. I argue this with a lot of noobs. My opinion is that 8x8 is too small for 4 thousand watt lamps to run efficiently. I know people that use that footprint, but not in a tent where you expect to walk around and have space. Sorry to be the downer.
Do not listen to your friends that think they know everything.. Do your own research, find information, read books, and find out what works best for you. Everyone knows someone that grows , and everyone that grows knows 3 people that have failed. Good luck